In 1660 Cristóbal de la Cruz presented himself before the commissioner ofthe Holy Office of the Inquisition in Veracruz, Mexico, claiming to beafflicted by doubts about the Catholic faith. Born in Algiers and capturedat the age of nine or ten by a Spanish galley force, he was taken to Spain,where he was quickly sold into slavery and baptized. Thirty years later, Dela Cruz denounced himself to the Mexican inquisitorial tribunal andproceeded to recount to the inquisitors a detailed and fascinating story ofhis life as he crossed Iberian and Mediterranean landscapes: escaping fromhis masters and being re-enslaved, encountering Muslims and renouncingChristianity, denouncing his guilt remorsefully before the Inquisitions ofBarcelona and Seville, and moving between belief in Catholicism and Islam.His case provides important insights into the relationship between religiousidentity and the regulatory efforts of powerful institutions in the earlymodern Spanish world.